Qt3D with Qt5.1 How do I install/compile?

I am beginning to learn Qt and I saw that Qt3D is very easy to use for 3D applications.
However, I have no clue as to how to install it.

What I understood is that Qt3D was an included package up until Qt5.
In "this mail":http://www.mail-archive.com/interest@qt-project.org/msg04398.html it is said that downloading and installing Qt3D should not be difficult, so what do I have to do to get it working? Do I need to recompile Qt5 with Qt3D or do I need to build it with Qt Creator?
In both of the options I get stuck, when I compile I get the error that there is no "make" but as far as I know I did all the necessary steps.
When I try to build it using Qt Creator it says that it can't find header files in the Qt3D directory, which is obvious because I have not yet installed it.

[edit]
Oh no... It seems that every time I build it I get different errors that don't make sense to me at all.
The errors seem to occur in the files that qtcreator generates automatically, cause when I open them there is a lock next to the name.